input :invalid{
    border:2px solid red;
}
p:last-child{
background-color: aquamarine;
}
p:last-of-type{
    background-color: blueviolet;
}
:not(p){
    font-size: 16px
}
:-ms-input-placeholder{
   color:chartreuse;
}
input:read-only{
    background-color: darkorange;
}
input:require{
    background-color: azure;
}
